One of the best things to do in Oslo is explore the islands that dot the fjord, but boat cruises are pricey and packed with tourists. To do it on your own for less, head to the Vippetangen area and catch the ferries run by Oslo-Fergene. Tickets are $5 per ride in advance or $7 when purchased onboard, though it’s wiser to spend $13 on a 24-hour pass that allows you to hop on and off as you please.